The phase mode in a ferroelectric liquid crystal has been studied by photon correlation spectroscopy under a dc electric field applied perpendicular to the helical axis of the liquid crystal. The parabolic continuous dispersion of the inverse correlation time τ-1 against the scattering wave number splits into two branches with a gap at nearly half the wave number at which τ-1 takes a minimum value. The gap frequency is found to increase in proportion to the applied electric field below the critical field Ec where the helical structure completely unwinds. Above Ec, τ-1 increases continuously with the wave number and shows no minimum. The experimental findings are compared with the recent predictions based on the phenomenological theory.
|ジャーナル||Japanese Journal of Applied Physics, Part 2: Letters|
|出版ステータス||出版済み - 12月 1 1997|
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